/*
各种地图服务的公共接口
 */
import TileLayer from 'ol/layer/Tile';
import XYZ from 'ol/source/XYZ';
import WMTS from 'ol/source/WMTS';
import TileWMS from 'ol/source/TileWMS';
import TileImage from "ol/source/TileImage";
import WMTSTileGrid from 'ol/tilegrid/WMTS';
import TileGrid from "ol/tilegrid/TileGrid";

import {
  get as getProjection
} from 'ol/proj';
import {
  getTopLeft,
  getWidth
} from 'ol/extent';


// 定义一些常量
const projection = getProjection('EPSG:3857');
const projectionExtent = projection.getExtent();
const size = getWidth(projectionExtent) / 256;
const resolutions = new Array(18);
const matrixIds = new Array(19);
for (let z = 0; z < 19; ++z) {
  resolutions[z] = size / Math.pow(2, z);
  matrixIds[z] = z;
}
// 天地图的tk
const tk = '7786923a385369346d56b966bb6ad62f';

// 百度地图参数
const resolutions2 = [];
for (let z = 0; z < 19; ++z) {
  resolutions2[z] = Math.pow(2, 18 - z);
}
let tilegrid = new TileGrid({
  origin: [0, 0],
  resolutions: resolutions2
});

// 天地图卫星影像地图服务
export function tdtImageMap(map) {
  return addTdtWmtsLayer(map, 'http://t0.tianditu.gov.cn/img_w/wmts', tk, 'img', 'w', 'tiles');
}
// 天地图影像注记地图服务
export function tdtImageLabelMap(map) {
  return addTdtWmtsLayer(map, 'http://t0.tianditu.gov.cn/cia_w/wmts', tk, 'cia', 'w', 'tiles');
}

// 天地图矢量底图地图服务
export function tdtVecMap(map) {
  return addTdtWmtsLayer(map, 'http://t0.tianditu.gov.cn/vec_w/wmts', tk, 'vec', 'w', 'tiles');
}
// 天地图矢量注记地图服务
export function tdtVecLabelMap(map) {
  return addTdtWmtsLayer(map, 'http://t0.tianditu.gov.cn/cva_w/wmts', tk, 'cva', 'w', 'tiles');
}

// 增加天地图WMTS地图服务图层
function addTdtWmtsLayer(map, url, key, layerName, matrixSet, format) {
  let source = new WMTS({
    url: `${url}?tk=${tk}`,
    layer: layerName,
    matrixSet: matrixSet,
    format: format,
    projection: projection,
    tileGrid: new WMTSTileGrid({
      origin: getTopLeft(projectionExtent),
      resolutions: resolutions,
      matrixIds: matrixIds
    }),
    style: 'default',
    wrapX: true,
    crossOrigin: 'anonymous'
  })
  let layer = new TileLayer({
    source: source
  })
  map.addLayer(layer);
  return layer;
}

// 移除某个地图图层
export function removeMapLayer(map, layer) {
  map.removeLayer(layer);
}



// arcgis卫星影像地图服务
export function arcgisImageMap(map) {
  return addXYZLayer(map,
    'https://services.arcgisonline.com/arcgis/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}');
}
// arcgis矢量底图+注记地图服务
export function arcgisVecMap(map) {
  return addXYZLayer(map,
    'https://services.arcgisonline.com/arcgis/rest/services/World_Street_Map/MapServer/tile/{z}/{y}/{x}');
}

// 高德卫星影像地图服务
export function gdImageMap(map) {
  return addXYZLayer(map,
    'https://webst03.is.autonavi.com/appmaptile?style=6&x={x}&y={y}&z={z}');
}
// 高德矢量底图地图服务
export function gdVecMap(map) {
  return addXYZLayer(map,
    'https://webrd03.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scale=1&style=7&x={x}&y={y}&z={z}');
}

// 百度影像地图服务
export function bdImageMap(map) {
  let source = new TileImage({
    projection: projection,
    tileGrid: tilegrid,
    tileUrlFunction: function(tileCoord, pixelRatio, proj) {
      if (!tileCoord) {
        return "";
      }
      var z = tileCoord[0];
      var x = tileCoord[1];
      var y = -tileCoord[2]-1;
      if (x < 0) {
        x = "M" + (-x);
      }
      if (y < 0) {
        y = "M" + (-y);
      }
      return "http://shangetu1.map.bdimg.com/it/u=x="+x+";y="+y+";z="+z+";v=009;type=sate&fm=46";
    },
    crossOrigin: 'anonymous'
  })
  let layer = new TileLayer({
    source: source
  })
  map.addLayer(layer);
  return layer;
}
// 百度影像注记地图服务
export function bdImageLabelMap(map) {
  let source = new TileImage({
    projection: projection,
    tileGrid: tilegrid,
    tileUrlFunction: function(tileCoord, pixelRatio, proj) {
      if (!tileCoord) {
        return "";
      }
      var z = tileCoord[0];
      var x = tileCoord[1];
      var y = -tileCoord[2]-1;
      if (x < 0) {
        x = "M" + (-x);
      }
      if (y < 0) {
        y = "M" + (-y);
      }
      return "http://online1.map.bdimg.com/tile/?qt=tile&x="+x+"&y="+y+"&z="+z+"&styles=sl&v=020";
    },
    crossOrigin: 'anonymous'
  })
  let layer = new TileLayer({
    source: source
  })
  map.addLayer(layer);
  return layer;
}
// 百度矢量底图地图服务
export function bdVecMap(map) {
  let source = new TileImage({
    projection: projection,
    tileGrid: tilegrid,
    tileUrlFunction: function(tileCoord, pixelRatio, proj) {
      if (!tileCoord) {
        return "";
      }
      var z = tileCoord[0];
      var x = tileCoord[1];
      var y = -tileCoord[2]-1;
      if (x < 0) {
        x = "M" + (-x);
      }
      if (y < 0) {
        y = "M" + (-y);
      }
      return "http://online3.map.bdimg.com/onlinelabel/?qt=tile&x=" + x + "&y=" + y + "&z=" + z +
        "&styles=pl&udt=20151021&scaler=1&p=1";
    },
    crossOrigin: 'anonymous'
  })
  let layer = new TileLayer({
    source: source
  })
  map.addLayer(layer);
  return layer;
}

// 增加XYZ格式的地图服务图层
function addXYZLayer(map, url) {
  let source = new XYZ({
    url: url,
    wrapX: true,
    crossOrigin: 'anonymous'
  })
  let layer = new TileLayer({
    source: source
  })
  map.addLayer(layer);
  return layer;
}

// 增加WMS格式的地图服务图层
function addWMSLayer(map, url, layerName) {
  let source = new TileWMS({
    url: url,
    params: {
      'LAYERS': layerName,
      'TILED': true
    },
    crossOrigin: 'anonymous'
  })
  let layer = new TileLayer({
    source: source
  })
  map.addLayer(layer);
  return layer;
}
